Hi, HorizontalSlider returns a value.

static function HorizontalSlider (position : Rect, value : float, leftValue : float, rightValue : float) : float

this should work:

float hSliderValue = 5.0f;

void OnGUI() {
      Rect slider = new Rect (50, 30, 100, 30);
      hSliderValue  = GUI.HorizontalSlider(slider,hSliderValue,1.0f,100.0f);
}

You need to feed the return value back into your variable:

float hSliderValue = 5.0f;

OnGUI {
    Rect slider = new Rect (50, 30, 100, 30);
    hSliderValue = GUI.HorizontalSlider(slider,hSliderValue,1.0f,100.0f);
}

A lot of the GUI controls work that way.

thnx .. worked for me .. was having the same problem